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org.eclipse.core.runtime.CoreException: Cannot create extension	at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:296)	at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:235)	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:318)	at org.eclipse.ui.internal.e4.compatibility.CompatibilityPart.createPart(CompatibilityPart.java:266)	at org.eclipse.ui.internal.e4.compatibility.CompatibilityEditor.createPart(CompatibilityEditor.java:61)